Time-dependent fatigue reliability analysis method based on bilinear cumulative damage

A technology of cumulative damage and analysis methods, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the load sequence effect without consideration, cannot reveal the physical nature of the failure process, and cannot reflect the dispersion and uncertainty of cumulative damage reliability and other issues to achieve the effect of reliability prediction

Inactive Publication Date: 2017-08-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF1 Cites 39 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the linear damage rule or Miner's rule has been widely used in structural fatigue analysis due to its simple form, but this rule has the following two defects: ① It simplifies the fatigue failure mechanism and does not consider the sequence effect of loa

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Time-dependent fatigue reliability analysis method based on bilinear cumulative damage
  • Time-dependent fatigue reliability analysis method based on bilinear cumulative damage
  • Time-dependent fatigue reliability analysis method based on bilinear cumulative damage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0040] Take the 45 steel friction welded joint fatigue test with notch as an example to further illustrate the present invention, as figure 1 Shown is a flow chart of a time-varying fatigue reliability analysis method based on bilinear cumulative damage provided by the present invention, which specifically includes the following steps:

[0041] A. Determine the probability distribution type of fatigue life data and its statistical characteristic parameters;

[0042] B. Select an appropriate reference life to establish a bilinear physical model of cumulative damage;

[0043] C. Establish a probabilistic cumulative damage model based on the bilinear cumulative damage physical model;

[0044] D. Establish a time-varying fatigue reliability model b...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a time-dependent fatigue reliability analysis method based on bilinear cumulative damage. The method includes the steps that 1, the probability distribution type and statistical characteristic parameter of fatigue life data are determined; 2, the appropriate reference life is selected, and a bilinear cumulative damage physical model is built; 3, according to the bilinear cumulative damage physical model, a probability cumulative damage model is built; 4, according to the stress-strength interference theory, a time-dependent fatigue reliability model is built; 5, a reliability curve is drawn and compared with an experimental result; the characteristics of a crack initiation stage and a crack propagation stage in the fatigue failure process and the randomness in the damage accumulation process are comprehensively considered, the bilinear damage theory serves as a modeling base, the probability cumulative damage model is built, through the combination with the stress-strength interference theory, the time-dependent fatigue reliability model based on cumulative damage and critical damage is built, the time-varying characteristics of fatigue loading and the dynamic behavior of the damage accumulation process are reflected, and the reliability prediction in the whole fatigue life cycle is achieved.

Description

technical field [0001] The invention belongs to the technical field of fatigue reliability analysis and fatigue life evaluation, and in particular relates to a reliability analysis method of fatigue failure. Background technique [0002] Fatigue damage has become one of the main failure modes of most mechanical equipment structures. According to statistics, the fracture damage caused by fatigue of mechanical components has reached 50% to 90%. Fatigue phenomena have spread across many fields such as aerospace, rail transit, shipbuilding, bridge construction, and machinery manufacturing, and fatigue accidents caused by them have emerged in endlessly. Fatigue damage is highly concealed and sudden, and there is no obvious sign before the damage, which poses a serious threat to the safe operation of mechanical equipment. Once damage occurs, it is easy to cause major accidents and loss of life and property. The fatigue life and reliability of mechanical equipment components or s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20G06F2119/04
Inventor 黄洪钟彭兆春李彦锋朱顺鹏米金华郭骏宇李贺
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap